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Codalio Blueprint — Stop Agents From Building the Wrong Thing

· 5 min read
Codalio Team
Codalio Team
AI app builder team

Codalio Blueprint is a free, MIT-licensed plugin that adds 10 planning and review skills to popular coding agents. The flagship skill, prd-builder, runs three lenses (Product & Scope, Architecture & Data, GTM) and synthesizes a single PRD that resolves contradictions before anyone writes code. Later skills review what gets built — auth exposure, performance cost, silent regressions, and which tests are worth writing. Outputs land as files in your repo — not ephemeral chat — so builders read a durable source of truth.

Codalio Blueprint hero — 10 planning skills, one install, zero code until you approve

Key takeaways​

  • Codalio Blueprint is a free, MIT-licensed plugin with 10 skills for Claude Code, Cursor, Codex, Antigravity, and Gemini.
  • prd-builder is the flagship: three lenses (Product & Scope, Architecture & Data, GTM) synthesize one PRD that forces contradictions into the open before code.
  • Four review skills — secure-coding, efficient-coding, regression-analysis, test-planning — catch defects before a change ships.
  • Outputs are files in your repo (e.g. docs/prd/), not chat messages — so CI, generators, and humans share one artifact.

You tell an agent to “build auth.” You step away. Ten minutes later you come back to generated code that ignores your schema, breaks your data model, and ships a UX that contradicts your product goals.

That failure mode is not the agent’s fault — it’s the missing step between idea and implementation: a disciplined, human-reviewed plan. Codalio Blueprint closes that gap — and keeps watching after the first PRD ships.

Blueprint is an MIT-licensed plugin with 10 skills for Claude Code, Cursor, Codex, Antigravity, and Gemini. Planning skills stop at a review gate before they write a line of code. Review skills score a change before you merge it. Try Codalio before you start building — catch contradictions while they’re cheap.

Supported agents: Claude Code, Cursor, Codex, Antigravity, Gemini.

Install in seconds​

/plugin marketplace add codalio/codalio-blueprint
/plugin install codalio-blueprint@codalio-blueprint

In Cursor: Settings → Plugins → search Codalio.

Already installed? Pull the latest skills with:

/plugin marketplace update codalio-blueprint

Then /reload-plugins (or start a new session).

Honest caveat: Blueprint is new and opinionated. Issues and PRs are currently more useful to the project than raw install counts.

Terminal install commands and success card — Codalio Blueprint installed, 10 skills activated

What’s inside the Blueprint​

One install, 10 skills — plan the product, then review what the agents build.

Plan & reconstruct​

SkillWhat it does
prd-builderTurns an idea into a defensible, synthesised PRD (Product & Scope; Architecture & Data; GTM).
mvp-checklistStandalone, deeper MVP scoping than the lite cut list inside prd-builder.
gtm-planFull go-to-market plan — channels, pricing, launch sequence.
arch-evaluationEvaluates an existing codebase’s architecture and tech debt against stated requirements.
doc-generationTurns an approved PRD into supporting docs (backlog, API sketch, onboarding).
code-to-prdReconstructs a PRD-style doc from an existing codebase.

Review before you ship​

SkillWhat it does
secure-codingReviews a change or data-access layer for authorization and data-exposure defects.
efficient-codingReviews a change for performance cost, from data access down to code volume.
regression-analysisTraces what a change could break through its consumers, ranked by silent failure risk.
test-planningDecides which tests must exist before a change ships, at which tier — and which aren’t worth writing.

Ten Blueprint skills circling a Review Gate padlock — no code until approved

Why prd-builder matters (the short version)​

Most LLM PRDs are lists of assumptions. prd-builder runs three lenses in sequence:

  1. Product & Scope — what we’re building and why.
  2. Architecture & Data — how it fits your stack and data model.
  3. GTM — who will use it and how we’ll launch.

Then it synthesizes a single PRD that forces contradictions into one place so you can resolve them before code is generated. Synthesised, not concatenated — that’s the difference between expensive rework and cheap alignment.

Concatenated vs synthesised PRD — conflicting notes on the left, one reconciled Markdown PRD on the right

Where the PRD lands​

The PRD is written as a file in your repository (for example docs/prd/), not as a transient chat message. That makes it a first-class artifact your CI, code generators, and human engineers can reference.

Repo tree mock showing docs/prd/my-feature-prd.md with an Approved badge

How teams use it​

  • Product managers get a defensible PRD that ties scope to architecture and GTM.
  • Engineers get a file to implement against — plus secure, efficiency, regression, and test reviews before merge.
  • Designers & PMMs get early GTM and UX constraints so the team ships coherent experiences.
  • Open source contributors can run code-to-prd to understand why code exists and arch-evaluation to propose improvements.

Contribute, critique, or file an issue​

Blueprint is intentionally opinionated and early. If you install it, please open issues or PRs — that feedback shapes the next iteration. The repo is MIT licensed and accepts contributions.

When you’re ready to go from approved PRD to prototype, backend, and deploy, continue in the Codalio AI app builder — same spec-first discipline, full pipeline.